Polar bears in zoos are particularly prone to stereotypic behaviours reflecting inadequate environmental complexity, and enrichment programmes are essential for their welfare.
Polar bears present one of the most challenging welfare cases in zoo biology. The vast ranging behaviour of wild polar bears cannot be replicated in any zoo environment, creating an inherent mismatch between biological needs and captive conditions. Stereotypic pacing is widespread and indicates chronic frustration or anxiety. Enrichment programmes reduce but cannot eliminate this behaviour. Some leading welfare scientists argue that polar bear keeping is inherently incompatible with good welfare, and several institutions have reached this conclusion and rehomed their bears. Where polar bears are kept, extensive, complex exhibits with regular and diverse enrichment are the minimum requirement.